Tire wear experament

[Sentientbydesign]

Your arguments are great. I was just too lazy to back up my posts. I think if we did, we'd end up at a stalemate. Unfortunately, I'm not getting all I need to get done during the day, so spending time researching my POV sits on the bottom of the totem pole.

Please let Jerry continue on with this experiment. I think we can all benefit or learn from any mistakes and modify as needed.

[awdjdmtalon]

Your arguments are great. I was just too lazy to back up my posts. I think if we did, we'd end up at a stalemate. Unfortunately, I'm not getting all I need to get done during the day, so spending time researching my POV sits on the bottom of the totem pole.

Please let Jerry continue on with this experiment. I think we can all benefit or learn from any mistakes and modify as needed.

HAHA lear from any mistakes. Thanks for the vote of confidance Nate.

[Sentientbydesign]

HAHA lear from any mistakes. Thanks for the vote of confidance Nate.

I didn't mean mistakes that you made in your experiment. I meant improper pressures that cause wear. Obviously the experiment is going to show flaws in one method over another.

Sorry if you took it another way.

[ldstang50]

HAHA lear from any mistakes. Thanks for the vote of confidance Nate.

JerryWe all know you're a screw up, we all find that out when the milkman was confirmed as your Dad.



Anyways, continue on, you're already getting outter tire wear by not having enough tire pressure. Do you think the colder temps have had anything to do with your tire wear?

[awdjdmtalon]

Nate I was just playing. I know what you ment.

Liam. I don't think the temps have much to do w/ it. W/the nitrogen in the tires the pressure stays pretty even.

[ldstang50]

Nate I was just playing. I know what you ment.

Liam. I don't think the temps have much to do w/ it. W/the nitrogen in the tires the pressure stays pretty even.

DOH!!! I don't know how I forgot, this was a whole topic earlier.

I think even in your first check, stating how you have outside wear instead of inner wear should start to turn heads about too much pressure coming from the factory

[joe603]

By all means, keep us updated! I also had the rear center balding on my OEM tires...they had to be replaced at 13k. I now have 32k on the car (17k on aftermarket Toyo Proxies) and the tires are still good.

[ldstang50]

Hey Jer, its been a month, any updates?

[awdjdmtalon]

I haven't gone another 1k miles yet. Car was parked for just over a week due to a surgery. But I will check them this week and see if there has been any changes.

[Sentientbydesign]

I haven't gone another 1k miles yet. Car was parked for just over a week due to a surgery. But I will check them this week and see if there has been any changes.

OMGosh! Is the G ok? Is it in full recovery lol. I assume you're recovering ok?

[awdjdmtalon]

Ok update. First allis well w/ me. The G is over it's driving withdraws.

I checked the tread depths last night. They are still the same as the last up date.

The tires have a little over 1600 miles on them to date. 90% of the driving has been city stop and go driving. 1% spirited mountian driving, and 9% highway driving.

My commute to work one way is 7 miles. So w/ going home at lunch and back i put 28 miles a day on the car.

[ldstang50]

sounds like I need to make another trip down.....the women go off and do their thing and drive all weekend up over the mountains for 48 straight hours.......bring the rockstars!!!!!!

[awdjdmtalon]

I have put a total of 2500 miles on the tire now. Time to change the oil and check the tire wear.

well the tire wear was identical on both rear tires.

8/32 9/32 8/32

The tire pressure was 33 psi. Lost 1 psi from the last time I adjusted the pressure. It has been cold here, (for VA). Readusting to 34 psi. Going to check again in 1K miles.

[johnparkyourcar]

Does your car have a toe/camber kit? And I'm assuming you're on stock suspension also...?

[awdjdmtalon]

Yes I am on stock suspension, running stock size tires. The car was aligned by me to factory specs where there were adjustments avalible. Everything was in spec when I aligned it. But the non adjustable points are not at zero spec., but are with in tolerance.

[awdjdmtalon]

Ok sorry for the long delay in updating. There was no change on the last update so I waited a bit longer this time.

Ok it has been just over 3 months and right at 1800 miles.

Tread dpeths for both tires are still 8/32 9/32(Actually it was like 8.5/32) 8/32. I checked the tire pressure due to the temp increase. Both rears had climbed to 37 psi. Readjusted back down to 34 psi.

Driving habits are still the same. Back and forth to work with some spirited driving on the back roads. And one 40' burn out just for giggles.

[telcoman]

Ok I put new tires on my G last night. And as we all know, they like to wear the centers out of the rear tires. I think this is for several reasons. 1 is the tire is too wide for thewheel making the tire buldge in the center. 2 Is the tire pressure being to high for #1.

So what I have done is this.

1. Filled the rear tires to 32 psi.

2. Filled them w/ nitrogen. This will eliminate tire pressure fluctuation due to temprature.

3. Measured the tread depth in 3 location. 1 the outer rib, 2 in the center and 3 on the inner rib.

I am going to drive 200 miles and recheck pressure to make sure it is constant, and tread depth.

If the tire is wearing in the center, lower pressure 1 psi and repeat.

If the outer edges have worn more then the center, raise pressure 1 psi and repeat.

Keep doing this until I reach a pressure where the tires are not wearing either spot unevenly.

Now for the hard part. Trying to drive the car nicely for this experament. <IMG NAME="icon" SRC="http://images.nicoclub.com/forums/image ... aughty.gif" BORDER="0">

Modified by awdjdmtalon at 10:40 AM 9/19/2008

Here is my post on the subject of tires.

http://forums.g35club.org/zerothread?id=307229

Since the replacement purchase at 47k miles I now have 90.7k or almost 44k miles on the replacement OEM Bridgestone Turanza's 235-45-18

I have been rotating this set every 6k miles or every other oil change. (28 oil changes thus far)

I checked the tread depth this morning and all are at 6/32

I keep the tire pressure at 37lbs when cold

I will probably replace these tires prior to next winter at which time I will have over 100k miles on my G

Telcoman

[pfarmer]

Here is my post on the subject of tires.

http://forums.g35club.org/zerothread?id=307229

Since the replacement purchase at 47k miles I now have 90.7k or almost 44k miles on the replacement OEM Bridgestone Turanza's 235-45-18

I have been rotating this set every 6k miles or every other oil change. (28 oil changes thus far)

I checked the tread depth this morning and all are at 6/32

I keep the tire pressure at 37lbs when cold

I will probably replace these tires prior to next winter at which time I will have over 100k miles on my G

Telcoman

I typically get into the 60k+ area on a set of tires. As far as experiment to measure contact patch it seems to me this could be done in a different method measuring the static patch pressure.

I think one mistake is that a tire only 'wears' from the outside in. As a tire flexes during use it changes characteristics, the lower the pressure the more it flexes would seem logical. I am not sure exactly how far the tire will expand due to centrifugal force which would be a good experiment in a controlled environment.

Perry

[awdjdmtalon]

Perry

The problem coupes have is that they wear the center out first on the rear tires.

You mentioned contact patch. I have several years of dealing w/ tire wear as a tech. Tires will wear the outer edges if the tire is under inflated, and the center out if it is over inflated. Tire pressure plays a HUGE role in contact patch.

As the sidewall of the tires will not expand radialy outward. But the tread section of the tire does. A good example is the tires on a drag car. The center of the tire "grows" as the tire spins faster.

Nascar uses tire pressure to contol the contact patch to effect the hadle ing of ther car. They will add or take out 1 psi to make the car push or rotate.

Nascar also uses Nitrogen in the tires to maintain a constant pressure as I explained eariler in the thread.

[telcoman]

Here is my post on the subject of tires.

http://forums.g35club.org/zerothread?id=307229

Since the replacement purchase at 47k miles I now have 90.7k or almost 44k miles on the replacement OEM Bridgestone Turanza's 235-45-18

I have been rotating this set every 6k miles or every other oil change. (28 oil changes thus far)

I checked the tread depth this morning and all are at 6/32

I keep the tire pressure at 37lbs when cold

I will probably replace these tires prior to next winter at which time I will have over 100k miles on my G

Telcoman

I just reached the 50k mile mark today on my tires with 6/32 left on all four tires.

Telcoman

[telcoman]

update

Decided to replace the tires at 99930 miles after 52715 miles on them with 5/32 tread left on each tire.The Infiniti dealer had a sale buy 3 get the fourth free on Bridgestone Turanza 235-45-18 tires till the end of the month. i decided to go for it.Rotating tires every other oil change at 6k miles greatly extends the life of the tires. I probably could have gotten another 5 to 10k miles but with winter coming to NJ soon I took advantage of the sale price.

Telcoman

[awdjdmtalon]

Addison. I am trying to figure out what your last post has to do with tire wear? Bronze tools may be helpfull in the mounting/dismounting tire to not harm the wheels.

[awdjdmtalon]

SPAM!

[TinsleyC]

Ok sorry for the long delay in updating. There was no change on the last update so I waited a bit longer this time.

Ok it has been just over 3 months and right at 1800 miles.

Just curious how the tires look now. I would think you would need to continue your experiment into the 10,000 mile range before a sizable difference in tire wear can be measured.

Thanks

[awdjdmtalon]

TinsleyC, I was just thinking about that last week. It has been over a year now and 10k miles. As soon as I get back from vacation, I plan on posting the results.

Look for them the middle of next week.

[awdjdmtalon]

Ok folks. It has been 15 months and 11000 miles +/- 200.

I checked tread depth today. And the results are............

RR O M I 5/32 6/32 5/32

LR 6/32 6/32 6/32

I have run the tires at 34 psi for the last 10k miles.

I think from the results, that 35 psi is 1psi too much to get even tire wear.

90% of my driving has been city stop go. The other 10% was hwy and mountian driving.

Let the speculation and flaming begin.

[TinsleyC]

Ok folks. It has been 15 months and 11000 miles +/- 200.

I checked tread depth today. And the results are............

RR O M I 5/32 6/32 5/32

LR 6/32 6/32 6/32

I have run the tires at 34 psi for the last 10k miles.

I think from the results, that 35 psi is 1psi too much to get even tire wear.

90% of my driving has been city stop go. The other 10% was hwy and mountian driving.

Let the speculation and flaming begin.

No flaming here...

So you have a little more tread on the right rear, in the middle? Does that normally mean more PSI is required to round out the center, making it wear more?

Still, your wear seems pretty even to me. I don't know what my tires are set at now, Discount Tire rotated them and who knows what they set them to. Think 34 is good?
Modified by TinsleyC at 1:05 PM 1/9/2010

[awdjdmtalon]

TinsleyC. You should not have this problem. This is an issue on 03-06 coupes.

As for the RR being worn slighly worn more on the outer edges. I have no expination. 1/32 is not a lot.

What usually happens is the center of the tire will wear bald, while the outer edges will still have 5/32 of tread left.

So I do belive that 34 psi in the rear of coupes will stop this from happening.

I would like to see someone else try this to back up my findings.

[telcoman]

update

Decided to replace the tires at 99930 miles after 52715 miles on them with 5/32 tread left on each tire.The Infiniti dealer had a sale buy 3 get the fourth free on Bridgestone Turanza 235-45-18 tires till the end of the month. i decided to go for it.Rotating tires every other oil change at 6k miles greatly extends the life of the tires. I probably could have gotten another 5 to 10k miles but with winter coming to NJ soon I took advantage of the sale price.

Telcoman

Another update

Rotated my tires today with my 38th oil change at 122584 miles
Measured the tread depth on all four tires on both edges and the center in a few spots on each tire.
All measured were 7/32 & 8/32 .

Telcoman